When I started, I educated my husband about it and he was fascinated as to how a woman's body works, and he has been right on board and it kept him really involved in the whole process.
I am sure most men would ultimately prefer this to having to wear a condom (or not having to wear one often), or knowing you have to stuff yourself with hormones or shove things in and up yourself, when it is the man who is potentially fertile far more days than we are. Charting is also cheap and portable and discreet.
*I don't mean to be disrespectful of other means of birth control - if you want or need to use them, do you, but no one should feel they have to use them when they would rather not if there is another alternative.
Get used to me. Black, confident, cocky; my name, not yours; my religion, not yours; my goals, my own; get used to me. -Muhammad Ali